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546

Compressed Air,

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4

cylinders B and c, which is conveyed thence to a storage receiver
for distribution by main to the various motors.

When work is done on a gas, the temperature is raised, by
reason of the conversion of that work into heat; and again, when
9, gas does work its temperature is lowered, for a reverse reason.

The changes are shewn in Fig. 562, Draw co-ordinates o F for
pressure and o J for volumes; then let the piston commence with
a ^cylinder volume i, opposite A, and atmospheric pressure 15 Ibs.
at i A, the temperature being 60 F. A c is a hyperbola or
isothermal (' at constant temperatureJ) of 60, while E B and D K